Lull argued Muslim monotheism was incomplete, not false, and only the Trinity proved it.

Evidence

Lull constantly presupposed, but normally treated as superfluous to assert, the Muslim belief in one God. He was aware that historically the Prophet called the Meccans away from paganism. The sum of all the controversy that he maintained against Islam through so long a life was to assert that the Christian doctrine of the Trinity and of the Incarnation is more appropriate to belief in the unity and power of God than Islamic definitions are. The point of this argument was that Muslim belief implies, although Muslims will not accept, the Christian creed. — Norman Daniel, Islam and the West, 263 (#corroborates, via linked claim)

These questions obsessed him, till he came to think of the relation of Christianity to Islam chiefly in these terms. He took rationalisation of the Trinity further than any other polemist and much further than contemporary schools of theology would allow. — Norman Daniel, Islam and the West, 980 (#expands, via linked claim)

Categorization

• XREF: connects to: Lull argued Islam was incomplete rather than false, implying the Christian creed — Norman Daniel, Islam and the West, 263; Lull pushed rational argument for the Trinity beyond medieval theological limits — Norman Daniel, Islam and the West, 980; Llull proved the Trinity through the dynamic relational structure of divine attributes

Related

• Lull argued Islam was incomplete rather than false, implying the Christian creed (similarity 0.94)
• Lull pushed rational argument for the Trinity beyond medieval theological limits (similarity 0.92)
• Medieval Christian polemic framed Islam as incomplete faith, not false one (similarity 0.89)
• Lull taught lay Christian merchants to prove the Trinity to Muslims (similarity 0.89)
• Even Lull doubted laypeople could grasp his Trinitarian proofs (similarity 0.87)
• Lull never sincerely engaged actual Muslim objections to the Trinity (similarity 0.86)
• Medieval Lull framed Muslim theological resistance as wilful stupidity (similarity 0.84)
• Rational proofs of the Trinity never convinced informed non-Christian disputants (similarity 0.83)
• Lull equipped lay merchants to argue the Trinity against Muslims and Jews alike (similarity 0.83)
• Muslims rejected the Trinity as polytheism and carnal generation (similarity 0.83)
• Lull expected lay merchants to win theological debates with Muslims using Trinitarian syllogisms (similarity 0.83)
• Medieval thinkers treated any non-Trinitarian concept of God as wholly defective (similarity 0.81)
• Lull proposed a syllogistic compromise that both Christians and Muslims refused to follow (similarity 0.81)
• Llull claimed Christianity provable from theistically shared ground with Muslims (similarity 0.81)
• Medieval polemicists coerced the Qur’an’s own terms into proofs of the Trinity (similarity 0.81)

Broader Connections

• Lull argued Islam was incomplete rather than false, implying the Christian creed #corroborates (0.97) — Norman Daniel, Islam and the West, 263
• Lull pushed rational argument for the Trinity beyond medieval theological limits #expands (0.80) — Norman Daniel, Islam and the West, 980
• Llull proved the Trinity through the dynamic relational structure of divine attributes #expands (0.75)